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Somehow your discharge superheat is below 10*( I think that's what it is) You're getting lquid in the suction. Check your suction temp sensor, maybe reading too high causing drain valve to open too much. Check all sensors and drain valve ops. What's superheat, subcool, & do have a level in flash tank? Put out a log of what you are seeing.

Does anyone have a service bulletin on the fill and drain valve operation? A coworker is having issues with a drain valve staying open all the time. I'm on vacation and would like to read up on sequence of operation before returning home. The flash tank is maintaining 9% and Eventually trips out on low discharge superheat.

Does anyone have a service bulletin on the fill and drain valve operation? A coworker is having issues with a drain valve staying open all the time. I'm on vacation and would like to read up on sequence of operation before returning home. The flash tank is maintaining 9% and Eventually trips out on low discharge superheat.

how old is the machine and what color sticker is on the stepper valve?